Behaviour packs for Claude Code, with a verdict beside each one. Every pack here was run against real tickets in a real repository, and the code it delivered was built. Each card states the pack's build rate and the baseline's, both with their denominators, and leaves the comparison to you — the corpus is not large enough for us to make it on your behalf.
Every figure below is the blocked condition: the agent was given the ticket with Bash withheld and told to write rather than run. A second condition was measured with Bash allowed, at a smaller sample and without one of the arms. The two are not averaged together — the gap between their baselines is as wide as the widest gap any pack opens on its own baseline — so this page reports one condition and names it rather than publishing a rate that describes neither.
The headline on every card is the frontend build rate: the share of frontend tickets whose delivered code the repository's own build accepted. The backend tickets are graded by a different gate — whether the delivered code imports and introduces no new lint or type diagnostic — so they are printed beside it rather than folded into it. Two populations, two denominators, no single number spanning both. The analysis page shows what each of them is made of.
Runs withdrawn as instrument failures are excluded and stay on record; the count of them is 1.
builds 40% n=20 (frontend) baseline 25% n=20 (frontend)
passes 39% n=18 (backend) baseline 47% n=15 (backend)
203217 stars, read 2026-08-17
builds 29% n=21 (frontend) baseline 25% n=20 (frontend)
passes 35% n=17 (backend) baseline 47% n=15 (backend)
98629 stars, read 2026-08-17
builds 50% n=20 (frontend) baseline 25% n=20 (frontend)
passes 39% n=18 (backend) baseline 47% n=15 (backend)
219750 stars, read 2026-08-17
builds 73% n=22 (frontend) baseline 25% n=20 (frontend)
passes 47% n=17 (backend) baseline 47% n=15 (backend)
104374 stars, read 2026-08-17
272970 stars, read 2026-08-17